Display apparatus using micro light-emitting diodes as display pixels

Abstract

A display apparatus includes a driving substrate, a plurality of micro light-emitting devices, and a common electrode. The micro light-emitting devices are separately arranged on the driving substrate, and each of the micro light-emitting devices includes an epitaxial structure, a first type electrode, and a second type electrode. The first type electrode and the second type electrode are disposed on opposite surfaces of the epitaxial structure. The common electrode is disposed on the driving substrate and located between the second type electrodes of the micro light-emitting devices, and the common electrode exposes an upper surface of each of the second type electrodes.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the priority benefit of Taiwan application serial no. 106135067, filed on Oct. 13, 2017. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a display apparatus. More particularly, the invention relates to a display apparatus that uses micro light-emitting diodes (LEDs) as display pixels.[0004]2. Description of Related Art[0005]In general, a common electrode and a micro light-emitting diode (LED) of a display panel are disposed in a display region, wherein the micro LED is located in each pixel structure region and is electrically connected to the common electrode, and an image is displayed by means of a driving control between the common electrode and the micro LED. At present, a material of the electrode material which is widely chosen for the ...

AI Technical Summary

Benefits of technology

This patent is about a display screen that improves the efficiency and conductivity of micro light-emitting devices. The screen includes a common electrode that is connected to the second type electrodes of each micro device, which ensures that the devices maintain good forward light-emitting efficiency and good electrical conductivity. Overall, this technology allows for brighter and more efficient display screens.

Problems solved by technology

However, since wirings and devices on a driving substrate are not resistant to high temperature, a high-temperature annealing process cannot be performed to obtain a high light transmittance and good electrical conductivity when ITO is used to form the common electrode; thereby, a light-emitting efficiency of the micro LED is lowered because the common electrode with a large thickness, a low light transmittance, and poor electrical conductivity covers the forward light-emitting surface, and a display quality of the display panel is also deteriorated.

In addition, compared to metallic materials, ITO has less flexibility and lower toughness, which easily increases the difficulty of manufacturing the common electrode of the display panel, and a process yield and the electrical conductivity of the display panel are thereby affected.

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